Iwakuni Climate by Month
Iwakuni, Yamaguchi, Japan
Hot summers and cool winters, with rain spread through the year.
Iwakuni has hot summers and cool winters, with rain spread through the year. Afternoon highs range from 50°F (10°C) in January to 89°F (31°C) in August, and January nights average 36°F (2°C). About 66 in (1665 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 89°F(31°C)
- Average high, August
- Coldest nights
- 36°F(2°C)
- Average low, January
- Rain per year
- 66 in(1665 mm)
- No clear rainy season
- Humidity
- 68%
- Sunniest: August
Best and worst months in Iwakuni
Best for weatherThe most comfortable weather comes in October, with highs around 74°F (23°C) and about 5.2 in (131 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 50°F (10°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Iwakuni weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 50°F(10°C) | 36°F(2°C) | 2.2 in(56 mm) | 63% | 2.4 |
| FebFebruary | 51°F(11°C) | 37°F(3°C) | 2.8 in(71 mm) | 61% | 3.0 |
| MarMarch | 57°F(14°C) | 42°F(5°C) | 5.1 in(130 mm) | 67% | 3.9 |
| AprApril | 66°F(19°C) | 50°F(10°C) | 6.4 in(162 mm) | 67% | 4.7 |
| MayMay | 74°F(23°C) | 59°F(15°C) | 6.9 in(174 mm) | 68% | 5.2 |
| JunJune | 79°F(26°C) | 67°F(19°C) | 9.8 in(250 mm) | 77% | 4.6 |
| JulJuly | 86°F(30°C) | 74°F(24°C) | 9.6 in(243 mm) | 74% | 5.0 |
| AugAugust | 89°F(31°C) | 76°F(25°C) | 5.3 in(135 mm) | 74% | 5.2 |
| SepSeptember | 82°F(28°C) | 70°F(21°C) | 6.9 in(174 mm) | 72% | 4.1 |
| OctOctoberBest | 74°F(23°C) | 59°F(15°C) | 5.2 in(131 mm) | 67% | 3.4 |
| NovNovember | 64°F(18°C) | 49°F(10°C) | 3.2 in(82 mm) | 64% | 2.6 |
| DecDecember | 55°F(13°C) | 40°F(4°C) | 2.2 in(57 mm) | 63% | 2.2 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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